People who are approved to use medical marijuana in Illinois may be facing a major hurdle when it comes to keeping their jobs. Some employers have a zero-tolerance policy when it comes to working with drugs in the system. Dan Linn, with the Illinois Cannabis Patients Association, says that’s a major problem. Patients approved for the program may be required to take random drug tests at their jobs and they won’t be able to use the new law as a defense if they fail the test. Employers maintain the right to discipline the patients. State officials are still trying to pin down the rules for the new medical marijuana program and licensees won’t be issued to sick people until this fall.